Stupid question ... does DAWN have to be installed in all AP's on the network?
If not, do I have to install something in the other APs?
Yes, you need to install DAWN on all AP's in the network. And you might want to install the snapshot version as some bugs have been fixed recently.
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A bit late, but in case anyone is searching for this: No need to configure any Wi-Fi options.
See this answer.
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But not the hostapd fixes. 
There were some infinity goto loops fixed and so on. See here:
https://forum.openwrt.org/t/dawn-a-decentralized-wireless-controller
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